Qi Dai
Weng Cho Chew
Li Jun Jiang
, "Differential Forms Inspired Discretization for Finite Element Analysis of Inhomogeneous Waveguides (Invited Paper),"
Progress In Electromagnetics Research,
Vol. 143, 745-760, 2013.
doi:10.2528/PIER13101801
http://www.jpier.org/PIER/pier.php?paper=13101801